Tax season officially ends on April 15 each year, but that date matters differently depending on whether you file early, file late, or owe money

For most people, tax season ends on April 15. That is the deadline to file your federal return with the IRS or request an extension. If you file by April 15, you are done with the IRS for that year. If you owe taxes and do not file or pay by that date, penalties and interest begin to accrue immediately.

The April 15 deadline is not flexible for federal taxes. Weekends and federal holidays do not move it — if April 15 falls on a Saturday, the deadline is actually April 17 that year. The IRS publishes the exact deadline each January on its website.

State tax deadlines usually match the federal deadline, but some states have different dates or do not have income tax at all. You need to check your state's tax authority website to know for certain.

Key Takeaways

  • The federal tax filing deadline is April 15 each year, and penalties start the day after if you owe and have not paid.
  • You can request a six-month extension to file, which moves your deadline to October 15, but an extension to file is not an extension to pay taxes owed.
  • If you are owed a refund, there is no penalty for filing late, but you will not receive your refund until you file.
  • State tax deadlines usually match April 15, but some states differ, so check your state's tax authority for the exact date.
  • Tax season for tax preparers and the IRS continues year-round, but the filing deadline for most people is April 15.

What happens if you file after April 15

If you miss the April 15 deadline and do not have an extension on file, the IRS charges a failure-to-file penalty. This penalty is 5 percent of the unpaid taxes for each month or part of a month that your return is late, up to 25 percent total. The penalty applies whether you owe money or not, though it is waived if you are owed a refund.

If you owe taxes and do not pay by April 15, the IRS also charges a failure-to-pay penalty of 0.5 percent per month, plus interest on the unpaid amount. Interest compounds daily. Both penalties can add hundreds or thousands of dollars to what you originally owed.

The longer you wait to file after April 15, the larger these penalties grow. Filing in May costs less in penalties than filing in July. If you know you will miss the deadline, filing an extension request before April 15 stops the failure-to-file penalty from starting, though the failure-to-pay penalty still applies if you owe money.

How to request a filing extension

You can request a six-month extension by filing Form 4868 with the IRS before April 15. This moves your filing deadline to October 15. You can file Form 4868 on paper by mail, electronically through tax software, or through a tax preparer.

An extension to file does not mean an extension to pay. If you owe taxes, you should pay as much as you can by April 15, even if you file an extension. Any amount you do not pay by April 15 will accrue interest and penalties, even though you have until October 15 to file your return.

If you file an extension and later discover you owe more than you paid, the interest and penalties apply only to the unpaid portion, calculated from April 15 forward. This is why paying something by April 15 — even if it is not the full amount — reduces your total cost.

Refunds and the April 15 deadline

If you are owed a refund, there is no penalty for filing after April 15. The IRS will not charge you failure-to-file or failure-to-pay penalties because you do not owe money. However, you will not receive your refund until you file your return.

Refunds are held for three years. If you do not file within three years of the April 15 deadline, the IRS keeps any refund you were owed. For example, if you are owed a 2023 refund, you must file by April 15, 2026, or the money is forfeited.

Many people file early specifically to receive their refund sooner. The IRS typically processes refunds within 21 days of receiving your return if you file electronically and choose direct deposit.

State tax deadlines and variations

Most states follow the federal April 15 deadline for income tax returns. However, some states have different dates. A few states do not have income tax at all, so there is no state filing deadline for residents of those states.

If you live in one state and work in another, you may need to file returns in both states. Each state has its own rules about who must file and what income is taxable. Your state's tax authority website lists the exact deadline and any extensions available.

If you file a federal extension, most states automatically extend your state filing deadline as well. However, you should confirm this with your state's tax authority, because a few states do not follow the federal extension.

What "tax season" means for different groups

For individual taxpayers, tax season is roughly January 1 through April 15. The IRS begins accepting returns on January 1 each year, and most people file between February and April.

For tax preparers and accountants, tax season is much longer. Many tax professionals work extended hours from January through June or July to handle late filers, amended returns, and business tax deadlines. Some work year-round on business and corporate taxes.

For the IRS itself, tax season never ends. The agency processes returns, audits, and payment plans throughout the year. The April 15 deadline is the busiest period, but the IRS handles tax matters continuously.

Amended returns and the three-year window

If you file your return and later discover an error, you can file an amended return using Form 1040-X. You have three years from the original April 15 deadline to file an amended return and claim a refund. After three years, the IRS will not refund any overpayment.

If you owe additional taxes because of an error, you should file an amended return as soon as possible. Interest and penalties continue to accrue on any unpaid amount from the original April 15 deadline, so filing an amended return does not reset the clock on what you owe.

Frequently Asked Questions

What if April 15 falls on a weekend or holiday?

The IRS moves the deadline to the next business day. If April 15 is a Saturday, the deadline becomes Monday, April 17. If April 15 is a Sunday, the deadline becomes Monday, April 17. If April 15 is a federal holiday, the deadline moves to the next day that is not a holiday or weekend. The IRS announces the exact deadline each year in January.

Can I get more than six months to file?

No. The standard extension is six months, moving your deadline from April 15 to October 15. You cannot request a second extension beyond October 15. If you need more time after October 15, you must file by that date or face penalties.

Do I have to file if I do not owe taxes?

Not always. If your income is below the filing threshold for your age and filing status, you are not required to file. However, if you had taxes withheld from your paycheck or are owed a refund, you should file to claim it. The IRS website has a tool to determine whether you must file.

What if I cannot pay what I owe by April 15?

File your return by April 15 anyway and pay as much as you can. The IRS offers payment plans and can work with you on a schedule. Penalties and interest will still apply to the unpaid balance, but filing on time stops the failure-to-file penalty from growing. Contact the IRS or a tax professional to discuss payment options.

Does tax season end differently for self-employed people?

The filing deadline is the same — April 15 — but self-employed people may also need to make quarterly estimated tax payments throughout the year. These payments are due on April 15, June 15, September 15, and January 15 of the following year. Missing these dates triggers penalties separate from the annual filing deadline.